Bought a Jumbo, few questions

Hi there, I today bought this honeycomb Jumbo. I already knew it was pretty much over polished. However, the movement is good and I like the dial. I have the idea that this dial started its life in a gold one but not sure.

I am pretty sure that the case back is not correct. Would anybody know the correct case back number? Also, does the crown look correct to you? The Omega lettering is a bit faded and appears to be slightly to the left. But under another angle it looks original again.

I have it on a temp strap with a wrong buckle.

Any info more than welcome!

Swiss fade....

Thanks, spent time on taking the pictures but not yet on looking at it!